A relatively thin metallic item, having a concave or cupped contour, designed to effect its own seal by compression against the circumference of a hole. It is used as a blowout plug in boilers, engines, and the like to relieve the pressure created by the expansion of fluids caused by heat or freezing.
Classification: Parts for steam or other vapor generating boilers and super-heated water boilers, except heat exchangers
NSN 6240-01-572-1643
NSN 5915-01-140-2823
NSN 5895-00-832-5747
NSN 5990-01-619-0935
NSN 5999-01-237-2666
NSN 5965-00-174-5792
NSN 6685-00-269-4895
NSN 6135-00-557-8874
NSN 5998-01-010-9489
NSN 5999-00-060-5300
NSN 5925-00-410-7560
NSN 6685-01-458-5629